Hydrophobic nano silica mixed thermoplastic hot-melt film with excellent adhesive strength

Abstract

The present invention relates to a thermoplastic hot melt film having excellent adhesive strength in which hydrophobic nanosilica is mixed. The resin composition contains nanosilica having a particle size of 1 to 100 nm and containing hydrophobic functional groups on its surface in the range of 0.1 to 5 phr (Parts per Hundred Resin), and the nanosilica forms nanosilica aggregates with an average size of the aggregates is within 100˜1200 nm. The thickness of the thermoplastic hot melt film is 0.02˜0.3 mm. The thermoplastic hot melt film of the present invention is mixed with nanosilica containing hydrophobic functional groups, lipophilic, on the surface to improve dispersibility, strengthen water resistance, and increase tensile strength. The material cost is reduced while securing one adhesive strength and excellent durability, and multi-press molding is possible, which has the effect of increasing energy saving and productivity.

What is claimed is: 
     
       1. A hydrophobic nano-silica mixed thermoplastic hot melt film:
 comprising any one or more resin compositions selected from thermoplastic polyurethane (TPU) and ethylene vinyl acetate (EVA), 
 wherein the resin composition comprising a nano-silica having a primary particle size of 1˜100 nm and contains 0.1 to 5Parts per Hundred Resin (phr) containing a hydrophobic functional group on the surface thereof, 
 wherein the nano-silica forms a nano-silica aggregate has an aggregate size of an average in a range of 100˜1200 nm and a thickness of the thermoplastic hot melt film is in a range of 0.02˜0.3 mm, wherein the hydrophobic functional group contained in the surface of the nanosilica particles is any one or more selected from alkyl group, dimethyl group, trimethyl group, dimethyl siloxane group, and methacryl group.